
<template>
  <div class="app-container">
    <el-form label-width="120px">
      <el-form-item label="讲师名称">
        <el-input v-model="teacher.name" />
      </el-form-item>
      <el-form-item label="讲师排序">
        <el-input-number v-model="teacher.sort" controls-position="right" min="0" />
      </el-form-item>
      <el-form-item label="讲师头衔">
        <el-select v-model="teacher.level" clearable placeholder="请选择">
          <!--
            数据类型一定要和取出的json中的一致，否则没法回填
            因此，这里value使用动态绑定的值，保证其数据类型是number
          -->
          <el-option :value="1" label="高级讲师" />
          <el-option :value="2" label="首席讲师" />
        </el-select>
      </el-form-item>
      <el-form-item label="讲师资历">
        <el-input v-model="teacher.career" />
      </el-form-item>
      <el-form-item label="讲师简介">
        <el-input v-model="teacher.intro" :rows="10" type="textarea" />
      </el-form-item>

      <!-- 讲师头像：TODO -->
      <el-form-item label="讲师头像">
        <!-- 头衔缩略图 -->
        <pan-thumb :image="teacher.avatar" />
        <!-- 文件上传按钮 -->
        <el-button type="primary" icon="el-icon-upload" @click="imagecropperShow=true">更换头像</el-button>

        <!--
      v-show：是否显示上传组件
      :key：类似于id，如果一个页面多个图片上传控件，可以做区分
      :url：后台上传的url地址
      @close：关闭上传组件
        @crop-upload-success：上传成功后的回调-->
        <image-cropper
          v-show="imagecropperShow"
          :width="300"
          :height="300"
          :key="imagecropperKey"
          :url="BASE_API+'/eduoss/fileoss'"
          field="file"
          @close="close"
          @crop-upload-success="cropSuccess"
        />
      </el-form-item>

      <el-form-item>
        <!-- 绑定的事件方法可以加() -->
        <el-button :disabled="saveBtnDisabled" type="primary" @click="saveOrUpdate">保存</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>
import teacherApi from "@/api/edu/teacher";
import ImageCropper from "@/components/ImageCropper";
import PanThumb from "@/components/PanThumb";

export default {
  components: { ImageCropper, PanThumb },
  data() {
    return {
      teacher: {
        name: "",
        sort: 0,
        level: 1,
        career: "",
        intro: "",
        avatar: ""
      },
      imagecropperShow: false,
      imagecropperKey: 0, //上传组件key值
      BASE_API: process.env.BASE_API,
      saveBtnDisabled: false //保证按钮不能被重复点击
    };
  },
  // 第一次跳转才会执行
  created() {
    this.init();
  },
  // 监听
  watch: {
    // 路由发生变化，方法就会执行
    $route(to, from) {
      this.init();
    }
  },
  methods: {
    close() {
      this.imagecropperShow = false;
      // 更新组件状态
      // 如果不改变，在上传成功之后不能直接上传图片
      this.imagecropperKey += 1;
    },
    cropSuccess(data) {//data做了封装，他相当于是response.data
      //上传之后返回url
      this.teacher.avatar = data.url;
      // 更新组件状态
      //this.imagecropperKey += 1;
    },
    // 判断路由参数方法抽取为初始化方法
    init() {
      if (this.$route.params && this.$route.params.id) {
        const id = this.$route.params.id;
        this.getInfo(id);
      } else {
        this.teacher = {};
      }
    },
    //保存或更新教师信息
    saveOrUpdate() {
      this.saveBtnDisabled = true;
      //判断是修改还是添加
      if (!this.teacher.id) {
        //添加
        this.saveTeacher();
      } else {
        //修改
        this.updateTeacher();
      }
    },
    //修改讲师
    updateTeacher() {
      teacherApi.updateTeacherInfo(this.teacher)
      .then(response => {
        this.saveBtnDisabled = false;
        //提示信息
        this.$message({
          type: "success",
          message: "修改成功!"
        });
        //回到列表页面
        this.$router.push("/teacher/table");
      })
    },
    // 保存教师信息
    saveTeacher() {
      teacherApi.addTeacher(this.teacher).then(sresponse => {
        this.saveBtnDisabled = false;
        //提示信息
        this.$message({
          type: "success",
          message: "添加成功!"
        });
        //回到列表页面
        this.$router.push("/teacher/table");
      });
    },
    // 根据id查询教师信息
    getInfo(id) {
      teacherApi.getTeacherInfo(id).then(response => {
        this.teacher = response.data.teacher;
      });
    }
  }
};
</script>